++++ Action for annulment of measures - Measures against which actions may be brought - Letter addressed by a Member of the Commission to a Member State expressing an opinion as regards the compatibility of an agreement between undertakings with the competition rules of the Treaty - No binding legal effects - Exclusion - Taking account thereof by addressee Member State when adopting national measures - Immaterial ( EEC Treaty, Arts 5, 85 and 173; Regulation No 17 of the Council )